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Femtocells can be used to improve the indoor coverage and bandwidth of 3G cellular networks in homes and buildings. The authors are designed to be placed in a fixed location. However, their use would also be interesting in mobile environments such as public transportation systems. This paper studies the mobility limitations at the layer 3 and suggests an approach to support mobility on femtocell networks. This solution employs the protocols already defined in the femtocell architecture, minimizing thus the impact on it.
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